Mike Dean 3-9-77
800 - green $1.00
500 - yellow $5.00
200 - maroon $20.00

No adress on card probably means PORTLAND. Most of the time no adress means they were ordered and paid in cash. Card marked denomination on one side only.
So, at least we know this chip was supposed to be a $20 chip.
I found a Mike Dean listed in Portland, left message on machine. hopefully he will call back.